The article briefly talks about that. I’ll save you the hunt.

“ This unboxing and setup has been fun, but I’d like to block all the bad traffic on my network. I’ve been using a workhorse of a DNS-level adblocker called Pi-Hole on a… yes, Pi, but it would be nice if I can reclaim that wee bit of hardware for something else and use a comparable add-on module in pfSense. Let’s explore that now.”

So basically that was only doing DNS level blocking. This article is about traffic decryption and manipulation.